Charles Day may refer to:

• Boots Day (Charles Day, born 1947), former baseball player
• Charles Day (boot blacking manufacturer) (died 1836), founder of Day and Martins Blacking
• Charles Day (Medal of Honor) (1844–1901), American soldier in the American Civil War
• Charles Day (1879-1931) (1879–1931), American engineer and co-founder of Day & Zimmermann
• Charles Day (rower) (1914–1962), American rower
• Charlie Day (Charles Peckham Day, born 1976), American actor
• Charles Bernard Day (born 1957), American judicial nominee
• Charles Dewey Day (1806–1884), Canadian judge
• Charles W. Day (1836–1906), Wisconsin state senator from De Pere, Wisconsin
• Charles Wayne Day (1942–2008), American blues guitarist

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